Go (golang) bindings for libexif

Provides basic support for reading EXIF tags on files using libexif and CGO.

How to install

Get libexif for your OS:

# OSX
brew install libexif

# Debian
apt-get install -y libexif-dev

# RedHat
dnf install -y libexif-devel

Then grab the exif package with go get:

go get github.com/nna774/exif

Usage

Install the package with go get and use import to include it in your project:

import "github.com/nna774/exif"

This is an example on how to read EXIF data from a file:

package main

import (
  "fmt"
  "github.com/nna774/exif"
)

func main() {
    data, err := exif.Read("_examples/resources/test.jpg")
    ...
    for key, val := range data.Tags {
        fmt.Printf("%s = %s\n", key, val)
    }
}

If you just have the image available as an io.Reader, you can parse the EXIF header like this:

reader := exif.New()

_, err = io.Copy(reader, data)

// exif.FoundExifInData is a signal that the EXIF parser has all it needs,
// it doesn't need to be given the whole image.
if err != nil && err != exif.FoundExifInData {
  t.Fatalf("Error loading bytes: %s", err.Error())
}

err := reader.Parse()

if err != nil {
  t.Fatalf("Error parsing EXIF: %s", err.Error())
}

for key, val := range reader.Tags {
  fmt.Printf("%s: %s\n", key, val)
}

License

This is Open Source released under the terms of the MIT License:

Copyright (c) 2020- Nana Kugayama, nana@nna774.net
Copyright (c) 2012-2015 José Carlos Nieto, https://menteslibres.net/xiam

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.